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4 years ago

How does an allele cause a trait in an organism?

2 answers:

6 0

On each chromosome, there a multiple alleles that stand for different genes/traits.

For example, Chromosome 3 might have a color of eyes, widow's peak, shortness, etc.

Aleks [24]4 years ago

6 0

Answer:

Alleles cause the production of a certain type of protein.

Explanation:

Genes mutate and can get two or more different or opposite forms, every form of such gene is known as an allele.

An allele is one of the common causes for deciding the trait or character of an individual because it causes the production of a certain type of protein.

Thus, the correct answer would be Alleles cause the production of a certain type of protein.

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In both prokaryotes and eukaryotes, how many copies of the chromosome are left after replication?

iogann1982 [59]

The answer is I think it's 4

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3 years ago

In a scientific experiment, a __

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In a scientific experiment, a VARIABLE changed is any factor that can change or be

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3 years ago

Atoms of isotopes of the same element contain the same number of

lana [24]

Atoms are the smallest unit of matter. Atoms of isotopes of the same element contain the same number of protons.

<h3>What are isotopes?</h3>

Isotopes are atoms of the same element which have different numbers of neutrons but the number of protons and electrons remains same.

As the isotopes of the atom have the same number of protons, so, their atomic number will also be the same.

Thus, it can be concluded that atoms of isotopes of the same element contain the same number of protons.

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2 years ago

g In the mid-1800s, overhunting of Northern Elephant Seals reduced their population size to fewer than 40 individuals. However,

Svet_ta [14]

Answer:

In the mid-1800s, over-hunting of Northern Elephant Seals reduced their population size to fewer than 40 individuals. However, the population has since rebounded to over 100,000 animals. The population went through a _bottle neck event (genetic drift)_, which makes it more susceptible to _developing a genetic disease_.

Explanation:

Genetic drift is the random change that occurs in the allelic frequency of a population through generations. The magnitude of this change is inversely related to the size of the original population. These changes produced by genetic drift accumulate in time. Eventually, some alleles get lost, while some others might set. Genetic drift affects a population and reduces its size dramatically due to a disaster or pressure-bottleneck effect- or because of a population split -founder effect- . The bottleneck effect most likely affects smaller populations.

In the exposed example, extensive hunting acted as a pressure that reduced the number of Northern elephant seals to fewer than 100. This population experienced one or many generations of small size since these animals were affected by hunting. As the survivors did not have the whole genetic pool of the original population, the population size might have recovered to a current population size of 100,000 individuals, but the genetic pool might have not. When the small population increases in size, it will have a genetically different composition from the original one. In these situations, there is a reduced genetic variability, with a possibility of developing a peculiar allelic component. If the survivors in the population carried or developed a mutation, probably this mutation passed from generation to generation. It will involve more individuals each time and increase the probability of developing a genetic disease.

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3 years ago

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2 years ago